Meanwhile melt chocolate over double boiler and let cool down partially. When cake is completely cooled, pour chocolate over top of cake - spreading evenly. Place sliced bananas onto melted chocolate evenly. Place cake in freezer for 25 minutes or until chocolate has hardened. Remove from freezer and spread a thick layer of vanilla ice cream over top of cake – refreeze for an additional 40-45 minutes. Remove from freezer and serve with drizzled chocolate sauce.